Loved the Upper Antelope Canyon! Very unique and a must see. The colors vary based on the lighting - as seen in the attached pictures. We had a great guide - Thomas. The most frustrating part of the tour were two young ladies that were not considerate of others and had to have their pictures taken, taken and taken. So inconsiderate of others and we had another tour group waiting for us to move on.
The experience with Viator was HORRIBLE and we would recommend direct booking versus Viator (it will save you $ and frustration). We booked online to be told our time was not available, to book a different time to be told it was not available, then another time was booked and that was changed again. All the follow-up emails contained the wrong tour times and meant multiple calls to confirm the time of our tour.
Another FYI - you will cross timelines on your way to the tour location). The Navajo Nation observes Daylight Savings Time, but Page does not. If you are coming from Sedona, Phoenix or Flagstaff - your tour time is based on the same timeframe as those areas.